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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a207e17d3a7fa978bf62bec8ce5ed3b2c19773d7655b04081750d9bbe03e57dc' 
  AND token = 'nSjUQxAGqo3oH1oJSJUJG+bS9VKOgANbiyjlWUUIOtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}